/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 171 by bh, Tue May 14 14:16:24 2002 UTC revision 179 by bh, Wed May 15 14:02:49 2002 UTC
# Line 139  class Layer(BaseLayer): Line 139  class Layer(BaseLayer):
139              numshapes, shapetype, mins, maxs = self.shapefile.info()              numshapes, shapetype, mins, maxs = self.shapefile.info()
140              self.numshapes = numshapes              self.numshapes = numshapes
141              self.shapetype = shapelib_shapetypes[shapetype]              self.shapetype = shapelib_shapetypes[shapetype]
142              self.bbox = mins[:2] + maxs[:2]  
143                # if there are shapes, set the bbox accordinly. Otherwise
144                # set it to None.
145                if self.numshapes:
146                    self.bbox = mins[:2] + maxs[:2]
147                else:
148                    self.bbox = None
149    
150              # estimate a good depth for the quad tree. Each depth              # estimate a good depth for the quad tree. Each depth
151              # multiplies the number of nodes by four, therefore we              # multiplies the number of nodes by four, therefore we
# Line 154  class Layer(BaseLayer): Line 160  class Layer(BaseLayer):
160                                               maxdepth)                                               maxdepth)
161    
162      def BoundingBox(self):      def BoundingBox(self):
163          """Return the bounding box of the layer's shapes in their default          """Return the layer's bounding box in the intrinsic coordinate system.
164          coordinate system"""  
165            If the layer has no shapes, return None.
166            """
167            # The bbox will be set by open_shapefile just as we need it
168            # here.
169          self.open_shapefile()          self.open_shapefile()
170          return self.bbox          return self.bbox
171    
172      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
173          """Return the layer's bounding box in lat/long coordinates"""          """Return the layer's bounding box in lat/long coordinates.
174          llx, lly, urx, ury = self.BoundingBox()  
175          if self.projection is not None:          Return None, if the layer doesn't contain any shapes.
176              llx, lly = self.projection.Inverse(llx, lly)          """
177              urx, ury = self.projection.Inverse(urx, ury)          bbox = self.BoundingBox()
178          return llx, lly, urx, ury          if bbox is not None:
179                llx, lly, urx, ury = bbox
180                if self.projection is not None:
181                    llx, lly = self.projection.Inverse(llx, lly)
182                    urx, ury = self.projection.Inverse(urx, ury)
183                return llx, lly, urx, ury
184            else:
185                return None
186    
187      def NumShapes(self):      def NumShapes(self):
188          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
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